90021504 has 32 divisors (see below), whose sum is σ = 239120640. Its totient is φ = 30007040.

The previous prime is 90021457. The next prime is 90021541. The reversal of 90021504 is 40512009.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116832 + ... + 117599.

It is an arithmetic number, because the mean of its divisors is an integer number (7472520).

Almost surely, 2^90021504 is an apocalyptic number.

It is an amenable number.

90021504 is an abundant number, since it is smaller than the sum of its proper divisors (149099136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90021504 is a wasteful number, since it uses less digits than its factorization.

90021504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234448 (or 234436 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 90021504 is about 9487.9662731272. The cubic root of 90021504 is about 448.1761637126.

It can be divided in two parts, 90021 and 504, that added together give a triangular number (90525 = T₄₂₅).

The spelling of 90021504 in words is "ninety million, twenty-one thousand, five hundred four".